What is the viability of trains on planets covered in water?

I want to write a science fiction book on a planet mostly covered by ocean, but I also want to incorporate trains into my story. However, it seems that with advances in ship and plane technology, trains may become obsolete. So, my question is, what role could trains possibly play in a world mostly covered by water?(It is not all water, but roughly 85%)

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What is the viability of trains on planets covered in water?

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